Some of the new features:
* Rich Text (WYSIWYG) Editor
Allows members to easily format their posts, signatures and personal messages.
* RSS (Really Simple Syndication) Export
Allow others to syndicate our content by setting up exclusive RSS export streams
from forums of our choice.
* Multiple Question Polls
Create new polls in this easy to use interface. Set different questions for multiple
question polls.
* Member's Display Name
Optionally allows members to choose thier own display name which is separate
from their log-in username, and change it as often as you allow.
* Improved Forum and Topic Marking
Forum are topic markers are now stored in the database. The comprehensive
system accurately tracks all your unread topics regardless of which computer you
use to access your account.
* Topic Rating
Allows members to rate each other's topics. This can be set per forum and per
usergroup.
* In-line Topic Editing
Edit topics from the forum listing without a need to refresh your
page!
* In-line Post Editing
Edit posts quickly from the topic view page without reloading the
topic!
* Member Name Suggest
When composing a new PM, enter part of a member's name and IPB will bring
up a list of suggested matches, instantly!
* MyAssistant Re-Designed Very good change! 
A combined floating palette comprising of instant notification of new PMs with
the ability to cycle through recent PMs. Instant "new posts" listing, and quick
search - all used without a single page refresh!